Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/operators/takeLast.js

@@ -0,0 +1,22 @@
+import { EMPTY } from '../observable/empty';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+export function takeLast(count) {
+    return count <= 0
+        ? () => EMPTY
+        : operate((source, subscriber) => {
+            let buffer = [];
+            source.subscribe(createOperatorSubscriber(subscriber, (value) => {
+                buffer.push(value);
+                count < buffer.length && buffer.shift();
+            }, () => {
+                for (const value of buffer) {
+                    subscriber.next(value);
+                }
+                subscriber.complete();
+            }, undefined, () => {
+                buffer = null;
+            }));
+        });
+}
+//# sourceMappingURL=takeLast.js.map